JPH0449492Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a heat exchanger in a cooling tower used in an air conditioner, a refrigeration system, etc., and particularly relates to a gas-liquid non-contact type heat exchanger. .

(Prior Art) Conventionally, this type of gas-liquid non-contact type heat exchanger has been described in Japanese Patent Application Laid-Open No. 100370/1983, and its structure is entirely made of synthetic resin, with flat vertical mutual A plurality of liquid flow passages parallel to each other, and flat air passages each having a vertical surface and having a horizontal air flow formed between these liquid flow passages, and these two fluid passages are mutually A cooling tower heat exchanger is described that is partitioned by heat exchange partition plates made of a plurality of synthetic resin plates that allow fluids to flow in a non-contact manner, and both walls of each air passage are formed by an inverted U-shaped member. The corrugated side walls of adjacent inverted U-shaped members are bonded to each other by protruding rib portions and are interconnected at their side edges by connecting panels to form the liquid flow passage. .

In the heat exchanger described in this publication, the inverted U-shaped member is suspended and supported on the upper part of the filling material by horizontal support beams as shown in FIG. Several of these heat exchangers are suspended and supported in a layered manner inside the filler facing the outside air intake to prevent white smoke from occurring in the winter.

(Problem to be Solved) In this way, in the prior art, dust and microorganisms adhere to the liquid passages that are narrow and curved to slow down the flow rate of the liquid during long-term use. However, it substantially narrows the cross-sectional area of the liquid passage, preventing the required flow rate from flowing down, and causing water to overflow on the supply side of these heat exchangers, severely wetting the area around them, as well as causing loss of circulating refrigerant. It is becoming.

In addition, in the case where these heat exchangers are installed above the filler and the liquid discharged from the heat exchanger is sprayed onto the filler (Figure 8), the spray liquid (water)
This has the disadvantage that the amount is insufficient, resulting in insufficient flow rate for the cooling tower as a whole.

This insufficient flow rate is also noticeable when several heat exchangers are suspended and supported in a hierarchical manner inside the packing material facing the outside air intake of the cooling tower (Figure 9).
In some cases, the desired prevention of white smoke generation may not be achieved.

This idea allows the flow rate of the liquid to be supplied to and discharged from the heat exchanger even if a portion of the liquid passage slows down in the main part of the heat exchanger of a gas-liquid non-contact type heat exchanger is clogged. The object of the present invention is to provide a heat exchanger that can maintain a constant flow rate without affecting the flow rate of a liquid passage, and to provide such a heat exchanger on the market.

(Means for Solving the Problems) In order to achieve the above problems, the synthetic resin vacuum or blow-molded heat exchanger in the cooling tower of this invention is a flat, thin-walled hollow body as a whole, and the inside is a curved liquid passage. is formed with a supply port and an outside air communication section, and a discharge port is provided at its lower end, and the liquid passage is formed between a baffle seal section formed by welding both wall surfaces to each other, and the liquid passage A part of the passage is a vertical overflow channel defined by a partition seal formed by vertical welding of both walls of the hollow body, and the remainder of this liquid passage is a slow-flowing liquid section, and the above-mentioned It is characterized in that the upper end of the partition seal part is a kind of weir, and the flowing liquid slowing part and the overflow channel communicate with each other via this weir.

(Function of the device) The function of this device configured as described above will be explained along with its usage.

First, a large number of supply pipes protruding at predetermined intervals from a common header for supplying circulating cooling water are inserted one by one into the supply holes of the heat exchanger, and the plurality of heat exchangers are mounted using a case or an appropriate support frame. A heat exchanger of a desired size is assembled by arranging the heat exchangers in parallel and forming air flow passages in the gaps between adjacent heat exchangers.

The heat exchanger assembled in this manner is placed above the packing material loaded in the main body of the cross-flow cooling tower, or arranged inside the packing material, as shown in FIGS. 8 and 9.

In this state, the cooling tower is operated, and the circulating cooling water, which is a refrigerant heated (approximately 30 to 70 degrees Celsius) by the air conditioner or refrigerator, which is the load section, is fed to the cooling water flowing down the cooling tower, which is partitioned by the weir of the heat exchanger. When supplied to the fast section position, the cooling water sequentially flows down through the bent passage formed between the baffle seal parts, comes into contact with both wall plates of the heat exchanger while being sufficiently stirred, and simply flows down vertically. It is in contact with the bulkhead plate for a much longer period of time, exchanging heat with the air flowing horizontally through the air passages through these two wall plates, warming them, and at the same time, heat is naturally absorbed by the air. It will be cooled accordingly.

In particular, when the heat exchanger group of this invention is placed above the packing material, the circulating water that has been indirectly cooled by air inside the heat exchanger is sprayed onto the lower packing material and then The cooling water is cooled by direct contact with the air, and the air, which has risen in temperature, is sucked toward the exhaust port in a state with increased absolute humidity, and the heat exchanger is cooled near the exhaust port. The heated absolute humidity discharged from the air passage mixes with constant air that has not changed with the outside air, and is exhausted outside the cooling tower without turning into white smoke (see Figure 8).

In addition, if a plurality of heat exchangers of this invention are stacked and arranged in layers inside the filler, they will come into direct contact with the cooling water on the filler and cool themselves, raising their own temperature and lowering the absolute humidity. All of the elevated air flows into all air passages of the heat exchanger of this invention. On the other hand, the cooling water flowing down in a meandering manner through the curved slow-flowing liquid section of the upper heat exchanger sequentially flows into the slow-flowing liquid section of the lower heat exchanger. is indirectly cooled by the air passing through the air passage, and the air whose temperature has risen due to this cooling is exhausted from the exhaust port to the outside of the cooling tower without producing white smoke.
(see figure).

If the cooling water supply pulsates or the supply amount temporarily increases, or if microorganisms etc. adhere to the slow flowing liquid path, the cross-sectional area of the slow flowing liquid path becomes narrow. When the flow rate decreases and the water level in the liquid reservoir rises and becomes higher than the weir, a portion of the cooling water passes through the overflow channel and directly flows down toward the discharge port, and does not overflow out of the heat exchanger.

Note that during the operation of the cooling tower, the supply ports of each heat exchanger are open to the outside air through the outside air communication ports,
The cooling water flows down in a meandering manner in the slow flowing liquid path in a natural flow manner. At the same time as the operation of the cooling tower is stopped, all of the cooling water inside the heat exchanger is discharged to the outside from the discharge port under atmospheric pressure.

(Effects of the device) In this device, which is constructed and operates as described above, there may be some clogging or flow rate restriction in the flowing liquid slowing section, which is the main part that performs heat exchange. Even if the flow rate of the supplied cooling water changes and the water level in the liquid reservoir rises, the cooling water passes over the weir, passes through the overflow channel that is part of the liquid passage, and is discharged downward, so the amount of water passing through itself does not change. Operation can be continued without fear of limiting. In particular, the heat exchanger of this invention can be arranged above the packing material loaded in the main body of the cross-flow cooling tower, or arranged inside the packing material, as shown in FIGS. 8 and 9, as in the prior art. Even when used as a heat exchanger for preventing white smoke in a cooling tower, even if a portion of the slow flowing liquid path becomes clogged, the overflow channel that is a part of the liquid path will cross the weir. Since the cooling water is discharged from the discharge port at the bottom after passing through the supply port, the supply amount does not decrease drastically without overflowing from the supply port, and the indirect flow between the air and the cooling water in this heat exchanger is prevented. The amount of heat exchanged does not decrease, and the desired generation of white smoke can be prevented.

Furthermore, in the present invention, since the supply ports of each heat exchanger are open to the outside air through the outside air communication ports, the internal pressure of this heat exchanger is always equal to the atmospheric pressure during operation of the cooling tower, and natural flow is prevented. Equationally, the cooling water flows down in a meandering manner within the flowing liquid slowing section, and when the operation of the cooling tower is stopped, all of the cooling water inside the heat exchanger is discharged to the outside at once through the discharge port under atmospheric pressure. Because it is discharged, even if all the circulating cooling water flows down and the exchange body becomes empty, there is no risk of it being crushed by atmospheric pressure, and water can be easily drained, preventing damage to the heat exchange body due to freezing in the winter. It can be prevented.

(Example) A typical embodiment of this invention will now be described.

Example 1 In FIG. 1, 10 is a heat exchanger, which is a flat hollow body made of vacuum-formed or flow-molded synthetic resin, and its wall plate is made of hard or semi-hard synthetic resin with a thickness of about 150 to 500 microns. It is more formed.

The synthetic resin is not particularly limited, but it is preferable to use one that is inexpensive and has good moldability, such as polyvinyl chloride, polyethylene, and polypropylene.

There is no particular limitation on the size, but the width is about 40 to 90 cm, the length is about 50 to 150 cm, the inner thickness of the heat exchanger 10 is about 3 to 5 mm, and there is a supply port 11 at the top and a discharge port 12 at the bottom. is provided.

A groove portion serving as an outside air communication portion 13 extending from the outer end into the hollow body in the axial direction is formed in a part of the supply port 11 to bulge outward. Even if the outside air communication part 13 is provided above the heat exchanger 10 separately from the supply port 11, the present invention is the same.

In the case where the heat exchanger 10 is formed by vacuum forming, both wall plates 14 and 15 are provided around the periphery.
A peripheral seal portion 16 is formed by welding the heat exchanger 10, and is parallel to the side edges 17, 18 of the heat exchanger 10, slightly inward from one side edge 17. A compartment seal 19 is formed along the edge 17 and welded to each other, and the upper and lower ends of the compartment seal 19 are respectively connected to a heat exchanger 10.
It does not reach the upper and lower edges 20, 21 of.

Between the partition seal portion 19 and the other side edge 18, a large number of horizontal baffle seal portions 22 are formed by welding the wall plates 14 and 15 to each other. A bent liquid passage 23 is formed, and these bent liquid passages 2
A wide part narrowed by the compartment seal part 19 and the side edge 18 is the flowing liquid slowing part 24, and both wall plates 14 and 15 in this part are the main parts of the heat exchanger 10. It has a heat exchange surface. On the other hand, a narrow vertical area between the compartment seal part 19 and the other side edge 17 serves as an overflow channel 25, and the upper end 26 of the compartment seal part 19 serves as a kind of weir.
The uppermost part of the baffle seal part 22 is formed slightly below this upper end 26. That is, the flowing liquid slowing section 24 and the overflow channel 25 communicate with each other via the weir at the upper end 26.

The shape of the aforementioned baffle seal portion 22 consists of the compartment seal portion 19 and these opposing side edges 18, as shown in FIG. The horizontal seal may be one in which the positions of the overlapping seals are shifted, and there is no particular limitation on the shape as long as the flowing liquid slowing section 24 in the flowing liquid passage 23 is curved. .

Further, the upper edge 20 of the heat exchanger 10 is provided with at least two hanging portions 27 that are integrally connected thereto, and in the illustrated example, holes are provided.

Further, in the embodiment shown in FIG. 5, the wall plates 14 and 15 of the heat exchanger 10 have bulging concavities and convexities 28 formed during molding over substantially the entire area of the curved liquid passage. Further, a soother protrusion 29 that maintains a distance between adjacent heat exchangers 10 is formed on a portion of both wall plates 14 and 15 or a portion of the peripheral seal portion 16 during vacuum molding or blow molding.

In order to use the heat exchanger 10 of the above embodiment, a plurality of supply pipes 31 protruding at predetermined intervals from a common header 30 for supplying circulating cooling water are inserted into the supply holes 11 of the heat exchanger 10, respectively. , is also fixed to the heat exchanger support frame 32 by its hanging portion 27. Further, if necessary, each lower end edge 21 of each heat exchanger 10 is also fixed to the heat exchanger support frame 32 using the holes 28. Thus, air flow passages 33 are formed between adjacent heat exchange bodies 10, forming a heat exchanger for a cooling tower.

The heat exchanger assembled in this manner is placed above the packing material loaded in the main body of the cross-flow cooling tower, or arranged inside the packing material, as shown in FIGS. 8 and 9.

In this state, the cooling tower is operated, and cooling water, which is a refrigerant that is heated (about 30 to 70°C) by the load section of the air conditioner or refrigerator, is transferred to each of the heat exchangers.
When the cooling water is supplied to the downstream liquid slowing section 24 that is partitioned by the weir 19 of
It flows down one after another through the bent passage 23 formed between them, comes into contact with each of the wall plates 14 and 15 while being sufficiently stirred,
The wall plate 14 lasts for a much longer time than simply flowing down vertically.
15 and through which each of the air passages 33
It exchanges heat with the air flowing horizontally, warming them, and at the same time, the air naturally absorbs heat and is cooled accordingly.

In particular, when the 10 groups of heat exchangers are arranged above the filler, the circulating water that has been indirectly cooled by air in the heat exchanger 10 is stored in the water sprinkling tank 34 and then transferred to the lower part. It is sprayed onto the filling material and cooled again by direct contact with the air, and this cooling water is also cooled by direct contact, and the air, which has risen in temperature itself, is sucked toward the exhaust port of the cooling tower with its absolute humidity increased. In the vicinity of this exhaust port, the heated absolute humidity discharged from the air passage 33 of the heat exchanger 10 mixes with the constant air that has not changed with the outside air, and flows out of the cooling tower without turning into white smoke. Evacuate the air (see Figures 7 and 8).

In addition, if a plurality of these 10 groups of heat exchangers are stacked and arranged hierarchically in multiple stages inside the filler, they will come into direct contact with the cooling water on the filler and cool themselves, raising their own temperature and increasing the absolute humidity. All of the exhausted air flows into all air passages 33 of the heat exchanger 10 of this invention.

On the other hand, the cooling water flowing down in a meandering manner through the curved downstream liquid slow speed section 24 of the upper heat exchange body 10 sequentially flows down to the downstream liquid slow speed section 24 of the lower heat exchange body 10. The cooling water inside the tower is indirectly cooled by the air passing through the air passage 33, and the air whose temperature has risen due to this cooling is exhausted outside the cooling tower from the exhaust port without producing white smoke. (See Figure 9).

If the supply amount of cooling water pulsates or increases temporarily, or if the flowing liquid slow speed section 2
4, microorganisms etc. adhere to the flowing liquid slowing section 24, the cross-sectional area of the flowing liquid slowing section 24 becomes narrow, and the flow rate decreases, and when the water level of the liquid reservoir section rises and becomes higher than the weir 19, a part of the cooling water overflows. It directly flows down through the passage 25 and does not overflow from the supply port 11 of the heat exchanger 10 onto the outer peripheral surface.

During operation of the cooling tower, the supply port 11 of each heat exchanger 10 is open to the outside air through the outside air communication port 13, and the cooling water flows through the flowing liquid slowing section 24 in a natural flow manner. It flows down in a meandering manner. At the same time as the operation of the cooling tower is stopped, all the cooling water inside the heat exchanger is discharged to the outside from the discharge port 12 under atmospheric pressure.

In the case where the discharge holes 12 of each heat exchanger 10 are distributed and formed into several small holes 12a as shown in FIG. 6, the above-mentioned watering tank 34 is not necessarily required.

Moreover, this heat exchanger 10 is a closed type heat exchanger 10.
When used as a heat exchanger, the heat exchanger 10 shown in FIGS. 1 and 2 is used, and a discharge header similar to the supply header is connected to these discharge ports 12, and the circulating cooling liquid flowing inside, Each heat exchanger 10
It goes without saying that it should be used in such a way that it does not mix with the spray water that is sprayed on the outside surface of the container.

(Effect unique to the embodiment) In addition to the effect of the present invention, the heat exchanger 10 in which the wall plates 14 and 15 are formed with finely uneven bulges 28 has a larger heat conduction area and further increases the heat conversion efficiency. improves.

In the case where the spacer protrusion 29 is bulged from a part of the wall plates 14, 15 or from the peripheral seal part 16, the assembly work is easy when a large number of heat exchangers 10 are arranged in parallel, and the spacer protrusion 29 is made to bulge out from a part of the wall plates 14, 15 or from the peripheral seal part 16. No spacer required.

The structure in which the outside air communication part 13 is provided in a part of the supply port 11 is simple in structure, can be formed simultaneously during vacuum or blow molding, and does not increase manufacturing costs.

The entire blow molded product can be formed without the peripheral seal portion 16, which not only improves the appearance but also increases the heat exchange area.

[Brief explanation of the drawing]

The drawings relate to this invention, and FIG. 1 is an external perspective view of a first embodiment of this heat exchanger, FIG. 2 is a front view of another embodiment with a different shape of the baffle part, and FIG. 3 is a longitudinal sectional view taken along line 3-3 in Fig. 1, Fig. 4 is a cross-sectional plan view taken along line 4-4 in Fig. 1, Fig. 5 is a longitudinal sectional view taken along line 5-5 in Fig. 1, Figure 6 is a partial front view showing another embodiment of the lower part of the heat exchanger, and Figure 7 shows a heat exchanger in which a plurality of heat exchangers shown in Figure 6 are attached to a common header at intervals. Side view,
FIGS. 8 and 9 are schematic diagrams of cooling towers incorporating this type of heat exchanger according to the prior art. Main symbols in the diagram: 10... heat exchanger, 11...
Supply port, 12...discharge port, 13...outside air communication section,
23...Bending passage, 24...Flowing liquid slow speed section, 25
...Overflow channel.

Claims (1)

[Scope of Claim for Utility Model Registration] 1) It is a flat thin-walled hollow body as a whole, and the inside is a curved liquid passage, with a supply port and an outside air communication part formed in the upper part, and a discharge port provided in the lower end. The liquid passage is formed between a baffle seal portion formed by welding both wall surfaces to each other, and a part of the liquid passage is formed by a partition seal formed by vertically welding both walls of the hollow body. The remaining part of this liquid passage is a slow flowing liquid section, and the upper end of the partition sealing section is a kind of weir, and the slow flowing flowing section and the overflow channel are separated by a vertical overflow channel. A synthetic resin vacuum or blow-molded heat exchanger in a cooling tower, which is characterized by communicating through this weir. 2) The cooling tower according to claim 1 of the utility model registration, characterized in that the wall plate of the hollow body formed by vacuum or blow molding has fine bulges formed so that almost the entire surface is uneven. Synthetic resin vacuum or blow molded heat exchanger. 3) A utility model characterized in that a spacer protrusion that maintains the distance between adjacent heat exchangers is integrally formed on the outer side of at least one side of the hollow body wall plate formed by vacuum or blow molding during vacuum or blow molding. A synthetic resin vacuum or blow molded heat exchanger for a cooling tower according to claim 1. 4) A synthetic resin vacuum or blow-molded heat exchanger for a cooling tower according to claim 1, wherein the outside air communication portion is a part of a supply port.